pub const UNCHANGED_FOLD_NAMESPACE: u64 = 0xD1FF_0002_0000_0000;Expand description
D-fix.5: namespace for per-buffer unchanged-fold provider ids.
Distinct high bits from HUNK_FOLD_NAMESPACE so a buffer’s hunk
fold source and its unchanged fold source register under different
overlay ids (both OR in the buffer’s low-32 id) — they coexist on the
same buffer covering disjoint regions (hunks vs. the gaps between).